The main neighboring hydrographic slopes of the Colbert river are: • north side:
Lake Saint-Pierre,
St. Lawrence River; • east side:
Landroche River,
Nicolet River,
Nicolet South-West River,
Saint-Zéphirin River; • south side:
Saint-François River; • west side:
Lévesque River,
Saint-François River. The Colbert river draws its head waters from various agricultural streams (notably the Fronteau stream, Daneau stream and cours d'eau Grande Ligne) near the Chemin du rang de la Grande-Plaine, in the municipality of
Saint-Zéphirin-de-Courval. This head area is located west of the village of
Saint-Elphège, west of the village of Saint-Zéphirin-de-Courval and northeast of the
Saint-François River. The course of the Colbert River descends on generally northwest into an agricultural zone, with a drop of , according to these segments: • north-west, forming small serpentines in an agricultural zone and crossing a few forest islets, crossing Chemin du Pays-Brûlé, up to
route 132 (route Marie-Victorin); • first to the north, then to the north-west, in an agricultural zone, crossing the Chemin des Huit, up to its mouth. The Colbert river empties onto the Batture de la Pierre à Chaux, on the south shore of
lake Saint-Pierre, to the southwest of the confluence of the
Landroche River, to the northeast of the confluence of the
Lévesque River and west of the village of
Baie-du-Febvre. == Toponymy ==